import type { Policy } from './types.js';
/** Which per-portal running total a signed amount counts against. */
export type SpendAsset = 'wei' | 'lamports';
export interface WindowCap {
    /** TOML field name, for the deny reason. */
    label: string;
    windowMs: number;
    cap: bigint;
}
export declare const HOUR_MS: number;
export declare const DAY_MS: number;
/** The rolling-window caps a policy sets for one asset, longest window last. */
export declare function windowCapsFor(policy: Policy, asset: SpendAsset): WindowCap[];
/**
 * Pure check: would signing `amount` now push any window over its cap?
 * `spent(windowMs)` returns what the ledger already holds for that trailing
 * window. Returns a human-readable deny reason, or null if every cap holds.
 * A zero amount never breaches (a cap of 0 means "no value at all", and
 * value-less calls carry no value).
 */
export declare function checkWindowCaps(caps: readonly WindowCap[], amount: bigint, spent: (windowMs: number) => bigint, unit: SpendAsset): string | null;
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